net/mac80211/ieee80211_iface.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/rtnetlink.h>
  14 #include <net/mac80211.h>
  15 #include "ieee80211_i.h"
  16 #include "sta_info.h"
  17 #include "debugfs_netdev.h"
  18
  19 void ieee80211_if_sdata_init(struct ieee80211_sub_if_data *sdata)
  20 {
  21         int i;
  22
  23         /* Default values for sub-interface parameters */
  24         sdata->drop_unencrypted = 0;
  25         sdata->eapol = 1;
  26         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
  27                 skb_queue_head_init(&sdata->fragments[i].skb_list);
  28
  29         INIT_LIST_HEAD(&sdata->key_list);
  30 }
  31
  32 static void ieee80211_if_sdata_deinit(struct ieee80211_sub_if_data *sdata)
  33 {
  34         int i;
  35
  36         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) {
  37                 __skb_queue_purge(&sdata->fragments[i].skb_list);
  38         }
  39 }
  40
  41 /* Must be called with rtnl lock held. */
  42 int ieee80211_if_add(struct net_device *dev, const char *name,
  43                      struct net_device **new_dev, int type)
  44 {
  45         struct net_device *ndev;
  46         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  47         struct ieee80211_sub_if_data *sdata = NULL;
  48         int ret;
  49
  50         ASSERT_RTNL();
  51         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
  52                             name, ieee80211_if_setup);
  53         if (!ndev)
  54                 return -ENOMEM;
  55
  56         ret = dev_alloc_name(ndev, ndev->name);
  57         if (ret < 0)
  58                 goto fail;
  59
  60         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
  61         ndev->base_addr = dev->base_addr;
  62         ndev->irq = dev->irq;
  63         ndev->mem_start = dev->mem_start;
  64         ndev->mem_end = dev->mem_end;
  65         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
  66
  67         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
  68         ndev->ieee80211_ptr = &sdata->wdev;
  69         sdata->wdev.wiphy = local->hw.wiphy;
  70         sdata->type = IEEE80211_IF_TYPE_AP;
  71         sdata->dev = ndev;
  72         sdata->local = local;
  73         ieee80211_if_sdata_init(sdata);
  74
  75         ret = register_netdevice(ndev);
  76         if (ret)
  77                 goto fail;
  78
  79         ieee80211_debugfs_add_netdev(sdata);
  80         ieee80211_if_set_type(ndev, type);
  81
  82         write_lock_bh(&local->sub_if_lock);
  83         if (unlikely(local->reg_state == IEEE80211_DEV_UNREGISTERED)) {
  84                 write_unlock_bh(&local->sub_if_lock);
  85                 __ieee80211_if_del(local, sdata);
  86                 return -ENODEV;
  87         }
  88         list_add(&sdata->list, &local->sub_if_list);
  89         if (new_dev)
  90                 *new_dev = ndev;
  91         write_unlock_bh(&local->sub_if_lock);
  92
  93         return 0;
  94
  95 fail:
  96         free_netdev(ndev);
  97         return ret;
  98 }
  99
 100 int ieee80211_if_add_mgmt(struct ieee80211_local *local)
 101 {
 102         struct net_device *ndev;
 103         struct ieee80211_sub_if_data *nsdata;
 104         int ret;
 105
 106         ASSERT_RTNL();
 107
 108         ndev = alloc_netdev(sizeof(struct ieee80211_sub_if_data), "wmgmt%d",
 109                             ieee80211_if_mgmt_setup);
 110         if (!ndev)
 111                 return -ENOMEM;
 112         ret = dev_alloc_name(ndev, ndev->name);
 113         if (ret < 0)
 114                 goto fail;
 115
 116         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 117         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 118
 119         nsdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 120         ndev->ieee80211_ptr = &nsdata->wdev;
 121         nsdata->wdev.wiphy = local->hw.wiphy;
 122         nsdata->type = IEEE80211_IF_TYPE_MGMT;
 123         nsdata->dev = ndev;
 124         nsdata->local = local;
 125         ieee80211_if_sdata_init(nsdata);
 126
 127         ret = register_netdevice(ndev);
 128         if (ret)
 129                 goto fail;
 130
 131         ieee80211_debugfs_add_netdev(nsdata);
 132
 133         if (local->open_count > 0)
 134                 dev_open(ndev);
 135         local->apdev = ndev;
 136         return 0;
 137
 138 fail:
 139         free_netdev(ndev);
 140         return ret;
 141 }
 142
 143 void ieee80211_if_del_mgmt(struct ieee80211_local *local)
 144 {
 145         struct net_device *apdev;
 146
 147         ASSERT_RTNL();
 148         apdev = local->apdev;
 149         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(apdev));
 150         local->apdev = NULL;
 151         unregister_netdevice(apdev);
 152 }
 153
 154 void ieee80211_if_set_type(struct net_device *dev, int type)
 155 {
 156         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 157         int oldtype = sdata->type;
 158
 159         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 160
 161         sdata->type = type;
 162         switch (type) {
 163         case IEEE80211_IF_TYPE_WDS:
 164                 sdata->bss = NULL;
 165                 break;
 166         case IEEE80211_IF_TYPE_VLAN:
 167                 break;
 168         case IEEE80211_IF_TYPE_AP:
 169                 sdata->u.ap.dtim_period = 2;
 170                 sdata->u.ap.force_unicast_rateidx = -1;
 171                 sdata->u.ap.max_ratectrl_rateidx = -1;
 172                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 173                 sdata->bss = &sdata->u.ap;
 174                 break;
 175         case IEEE80211_IF_TYPE_STA:
 176         case IEEE80211_IF_TYPE_IBSS: {
 177                 struct ieee80211_sub_if_data *msdata;
 178                 struct ieee80211_if_sta *ifsta;
 179
 180                 ifsta = &sdata->u.sta;
 181                 INIT_WORK(&ifsta->work, ieee80211_sta_work);
 182                 setup_timer(&ifsta->timer, ieee80211_sta_timer,
 183                             (unsigned long) sdata);
 184                 skb_queue_head_init(&ifsta->skb_queue);
 185
 186                 ifsta->capab = WLAN_CAPABILITY_ESS;
 187                 ifsta->auth_algs = IEEE80211_AUTH_ALG_OPEN |
 188                         IEEE80211_AUTH_ALG_SHARED_KEY;
 189                 ifsta->flags |= IEEE80211_STA_CREATE_IBSS |
 190                         IEEE80211_STA_WMM_ENABLED |
 191                         IEEE80211_STA_AUTO_BSSID_SEL |
 192                         IEEE80211_STA_AUTO_CHANNEL_SEL;
 193
 194                 msdata = IEEE80211_DEV_TO_SUB_IF(sdata->local->mdev);
 195                 sdata->bss = &msdata->u.ap;
 196                 break;
 197         }
 198         case IEEE80211_IF_TYPE_MNTR:
 199                 dev->type = ARPHRD_IEEE80211_RADIOTAP;
 200                 dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 201                 break;
 202         default:
 203                 printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",
 204                        dev->name, __FUNCTION__, type);
 205         }
 206         ieee80211_debugfs_change_if_type(sdata, oldtype);
 207 }
 208
 209 /* Must be called with rtnl lock held. */
 210 void ieee80211_if_reinit(struct net_device *dev)
 211 {
 212         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 214         struct sta_info *sta;
 215
 216         ASSERT_RTNL();
 217
 218         ieee80211_free_keys(sdata);
 219
 220         ieee80211_if_sdata_deinit(sdata);
 221
 222         switch (sdata->type) {
 223         case IEEE80211_IF_TYPE_AP: {
 224                 /* Remove all virtual interfaces that use this BSS
 225                  * as their sdata->bss */
 226                 struct ieee80211_sub_if_data *tsdata, *n;
 227                 LIST_HEAD(tmp_list);
 228
 229                 write_lock_bh(&local->sub_if_lock);
 230                 list_for_each_entry_safe(tsdata, n, &local->sub_if_list, list) {
 231                         if (tsdata != sdata && tsdata->bss == &sdata->u.ap) {
 232                                 printk(KERN_DEBUG "%s: removing virtual "
 233                                        "interface %s because its BSS interface"
 234                                        " is being removed\n",
 235                                        sdata->dev->name, tsdata->dev->name);
 236                                 list_move_tail(&tsdata->list, &tmp_list);
 237                         }
 238                 }
 239                 write_unlock_bh(&local->sub_if_lock);
 240
 241                 list_for_each_entry_safe(tsdata, n, &tmp_list, list)
 242                         __ieee80211_if_del(local, tsdata);
 243
 244                 kfree(sdata->u.ap.beacon_head);
 245                 kfree(sdata->u.ap.beacon_tail);
 246                 kfree(sdata->u.ap.generic_elem);
 247
 248                 if (dev != local->mdev) {
 249                         struct sk_buff *skb;
 250                         while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 251                                 local->total_ps_buffered--;
 252                                 dev_kfree_skb(skb);
 253                         }
 254                 }
 255
 256                 break;
 257         }
 258         case IEEE80211_IF_TYPE_WDS:
 259                 sta = sta_info_get(local, sdata->u.wds.remote_addr);
 260                 if (sta) {
 261                         sta_info_free(sta);
 262                         sta_info_put(sta);
 263                 } else {
 264 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 265                         printk(KERN_DEBUG "%s: Someone had deleted my STA "
 266                                "entry for the WDS link\n", dev->name);
 267 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 268                 }
 269                 break;
 270         case IEEE80211_IF_TYPE_STA:
 271         case IEEE80211_IF_TYPE_IBSS:
 272                 kfree(sdata->u.sta.extra_ie);
 273                 sdata->u.sta.extra_ie = NULL;
 274                 kfree(sdata->u.sta.assocreq_ies);
 275                 sdata->u.sta.assocreq_ies = NULL;
 276                 kfree(sdata->u.sta.assocresp_ies);
 277                 sdata->u.sta.assocresp_ies = NULL;
 278                 if (sdata->u.sta.probe_resp) {
 279                         dev_kfree_skb(sdata->u.sta.probe_resp);
 280                         sdata->u.sta.probe_resp = NULL;
 281                 }
 282
 283                 break;
 284         case IEEE80211_IF_TYPE_MNTR:
 285                 dev->type = ARPHRD_ETHER;
 286                 break;
 287         }
 288
 289         /* remove all STAs that are bound to this virtual interface */
 290         sta_info_flush(local, dev);
 291
 292         memset(&sdata->u, 0, sizeof(sdata->u));
 293         ieee80211_if_sdata_init(sdata);
 294 }
 295
 296 /* Must be called with rtnl lock held. */
 297 void __ieee80211_if_del(struct ieee80211_local *local,
 298                         struct ieee80211_sub_if_data *sdata)
 299 {
 300         struct net_device *dev = sdata->dev;
 301
 302         ieee80211_debugfs_remove_netdev(sdata);
 303         unregister_netdevice(dev);
 304         /* Except master interface, the net_device will be freed by
 305          * net_device->destructor (i. e. ieee80211_if_free). */
 306 }
 307
 308 /* Must be called with rtnl lock held. */
 309 int ieee80211_if_remove(struct net_device *dev, const char *name, int id)
 310 {
 311         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 312         struct ieee80211_sub_if_data *sdata, *n;
 313
 314         ASSERT_RTNL();
 315
 316         write_lock_bh(&local->sub_if_lock);
 317         list_for_each_entry_safe(sdata, n, &local->sub_if_list, list) {
 318                 if ((sdata->type == id || id == -1) &&
 319                     strcmp(name, sdata->dev->name) == 0 &&
 320                     sdata->dev != local->mdev) {
 321                         list_del(&sdata->list);
 322                         write_unlock_bh(&local->sub_if_lock);
 323                         __ieee80211_if_del(local, sdata);
 324                         return 0;
 325                 }
 326         }
 327         write_unlock_bh(&local->sub_if_lock);
 328         return -ENODEV;
 329 }
 330
 331 void ieee80211_if_free(struct net_device *dev)
 332 {
 333         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 334         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 335
 336         /* local->apdev must be NULL when freeing management interface */
 337         BUG_ON(dev == local->apdev);
 338         ieee80211_if_sdata_deinit(sdata);
 339         free_netdev(dev);
 340 }